Question

A. CHECK ALL THAT ARE CORRECT: The t-distribution is

Group of answer choices

flatter and more spread out than the normal distribution

closer to the normal distribution when df is very high

closer to the normal distribution when df is very low

more positively skewed than the normal distribution

B. In the context of a *one-sample t-test,* what is the
estimated standard error, s_{m,} for a sample size of n = 4
with s^{2} = 16?

c. For a *one sample t-test*, what is the critical t-stat
for a one-tailed test with alpha = 0.01, and a sample size of n =
6?

Answer #1

For the standard normal distribution, compute Z0.69.
Use Excel and round the answer to two decimal places.
Consider the following test performed with the level of
significance 0.01: A random sample of size 28 is obtained from a
normally distributed population. The population standard deviation
is equal to 3.6. The sample mean happened to be 24. For this
hypothesis test, what will be the critical value (the relevant
z-alpha)? Round the answer to three decimal
places.
A probability distribution of all...

Using the t
distribution table, identify the t statistics that would
set the critical regions in a hypothesis test for the following
alphas and n’s (2 points each). Remember to check
direction and df when choosing the
column/row.
One-tailed test, α =
.05, n = 10
Two-tailed test, α =
.05, n = 10
One-tailed test, α =
.01, n = 15
Two-tailed test, α =
.01, n = 20

Answer the following about T-Test & T-distributions:
1. Which of the following statements related to the
t-distribution is not true?
Select one:
a. Since the population standard deviation is usually unknown,
the standard error of the sample mean is estimated using the sample
standard deviation as an estimator for the population standard
deviation. The formula is s/sqrt(n).
b. The population must be t-distributed in order to use the
t-distribution.
c. Like the Normal distribution, the t-distribution is symmetric
and unimodal....

True or false:
1. When constructing a confidence interval for a sample
Mean, the t distribution is appropriate whenever the sample size is
small.
2. The sampling distribution of X (X-bar) is not always
a normal distribution.
3. The reason sample variance has a divisor of n-1
rather than n is that it makes the sample standard deviation an
unbiased estimate of the population standard
deviation.
4. The error term is the difference between the actual
value of the dependent...

Encircle the letter that corresponds to your answer:
1. When one analyses data based on a sample, one
calculates a
Parameter b) variable c)
constant d) statistics 2. Mathematical methods used to draw
tentative conclusions about a population based on sample Data are
referred to as
Descriptive statistics b) sample
statistics c) inferential statistics d)
random sampling 3. The mean is ____ sensitive to extreme scores
than the median.
More b)
equally c) less 4. If a distribution
of raw...

True and False
a) In a random sample of 100 observations from a normal
distribution, the inter-quartile range will contain approximately
68 of the observations. ____
b.) In a one-tailed test where n=20, the value of the Z-test
statistic equals -1.81. If α were set at 0.01, this test would be
considered significant. ____
c.) If a statistical test is significant at the 1% (alpha =
0.01) level, then it must also be significant at the 10% (alpha =
0.10)...

Which of the following statements are TRUE
Note that there may be more than one correct answer; select all
that are true.
a)
The power of a test is only influenced by the hypothesized
parameter value, and not the true parameter value.
b)
For a two-sided alternative hypothesis, as the difference
between the true parameter value and the hypothesized parameter
value increases, the probability of a Type I error increases.
c)
It is desirable to have tests with high power,...

3. There is a different t distribution for every hypothetical
sample size.
True or False
2. For a chi-square test, if the observed number of cases in
your sample fits what you expect given your knowledge of the
population, you would reject the null hypothesis.
True or False
1. A two-tailed hypothesis will have more statistical power than
a one-tailed hypothesis.
True or False

Which of the following statements are true of correlation
coefficients?
Group of answer choices
The more negative the number is, the weaker the
relationship.
A correlation coefficient of -0.90 indicates that there is an
inconsistent relationship between the variables.
The closer the coefficient is to 1 or -1, the weaker the
relationship.
A correlation coefficient of 0.05 indicates that there is an
inconsistent relationship between the variables.
Which type of analysis is more flexible than an
independent-samples t-test and allows...

1. In R, inverse probability distribution functions start with q
(no reason why really; it’s just a convention). To calculate the
critical value for a two-tailed t-test with n
− k = 100 and α = 0.05, use the inverse
t distribution command. For the inverse t function, type
qt(1-0.05/2, 100). To find the one-tailed critical value for a
t distribution for α = 0.01 and 100 degrees of
freedom, type qt(1-0.01, 100).
2. To find the critical value from...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 5 minutes ago

asked 5 minutes ago

asked 13 minutes ago

asked 18 minutes ago

asked 21 minutes ago

asked 22 minutes ago

asked 25 minutes ago

asked 38 minutes ago

asked 40 minutes ago

asked 47 minutes ago

asked 51 minutes ago